Jackson Tutorial
Selected Reading
- Jackson - Useful Resources
- Jackson - Quick Guide
- Jackson - Streaming API
- Jackson - Tree Model
- Jackson - Data Binding
- Object Serialization
- Jackson - ObjectMapper Class
- Jackson - First Application
- Jackson - Environment Setup
- Jackson - Overview
- Jackson - Home
Selected Reading
- Who is Who
- Computer Glossary
- HR Interview Questions
- Effective Resume Writing
- Questions and Answers
- UPSC IAS Exams Notes
Object Serialization
Jackson - Object Seriapzation
let s seriapze a java object to a json file and then read that json file to get the object back. In this example, we ve created Student class. We ll create a student.json file which will have a json representation of Student object.
Create a java class file named JacksonTester in C:>Jackson_WORKSPACE.
File: JacksonTester.java
import java.io.File; import java.io.IOException; import com.fasterxml.jackson.core.JsonGenerationException; import com.fasterxml.jackson.core.JsonParseException; import com.fasterxml.jackson.databind.JsonMappingException; import com.fasterxml.jackson.databind.ObjectMapper; pubpc class JacksonTester { pubpc static void main(String args[]){ JacksonTester tester = new JacksonTester(); try { Student student = new Student(); student.setAge(10); student.setName("Mahesh"); tester.writeJSON(student); Student student1 = tester.readJSON(); System.out.println(student1); } catch (JsonParseException e) { e.printStackTrace(); } catch (JsonMappingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } private void writeJSON(Student student) throws JsonGenerationException, JsonMappingException, IOException{ ObjectMapper mapper = new ObjectMapper(); mapper.writeValue(new File("student.json"), student); } private Student readJSON() throws JsonParseException, JsonMappingException, IOException{ ObjectMapper mapper = new ObjectMapper(); Student student = mapper.readValue(new File("student.json"), Student.class); return student; } } class Student { private String name; private int age; pubpc Student(){} pubpc String getName() { return name; } pubpc void setName(String name) { this.name = name; } pubpc int getAge() { return age; } pubpc void setAge(int age) { this.age = age; } pubpc String toString(){ return "Student [ name: "+name+", age: "+ age+ " ]"; } }
Verify the result
Compile the classes using javac compiler as follows:
C:Jackson_WORKSPACE>javac JacksonTester.java
Now run the jacksonTester to see the result:
C:Jackson_WORKSPACE>java JacksonTester
Verify the Output
Student [ name: Mahesh, age: 10 ]Advertisements